Toward Two-Dimensional MoS2 Electrets with Modulated Fluorescence

Abstract We show how spatially controlled sulfur vacancy engineering enables monolayer MoS2 to act as an electret, storing quasi-permanent electrostatic charge within a single atomic layer and modulating its emission properties. Sulfur vacancies are created by stamp-assisted, electrode-free electrochemical nanolithography, yielding tunable defect densities from 1010 to 1013 cm–2. The vacancy domains act as electron traps, resulting in surface charge density up to 1 μC cm–2, with charge retention exceeding 300 days under ambient conditions. Kelvin probe and electric force microscopies reveal electrostatic patterns replicating the lithographic motif. These domains also define a colocalized exciton-quenching regions in fluorescence microimages. They modulate the exciton fluorescence lifetime recorded at room temperature from tens of nanoseconds to a few hundred picoseconds by enhanced nonradiative exciton deactivation and induce a different balancing between excitons and trion emission via free electron draining from the untreated zones of the crystal.

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Publication Details

Journal
Nano Letters
Published
2026-10-16
DOI
https://doi.org/10.1021/acs.nanolett.6c03760
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Toward Two-Dimensional MoS2 Electrets with Modulated Fluorescence

Denis Gentili, Pasquale D’Angelo, F. Borgatti, Andrea Liscio et al.
Nano Letters
2D Materials and Applications
article

Toward Two-Dimensional MoS2 Electrets with Modulated Fluorescence

Denis Gentili, Pasquale D’Angelo, F. Borgatti, Andrea Liscio, Eugenio Lunedei, Matteo Mannini, L. Seravalli, Massimiliano Cavallini, Niccolò Borghi, Edoardo Chini, Fiorenza Esposito
article en

Abstract

Abstract We show how spatially controlled sulfur vacancy engineering enables monolayer MoS2 to act as an electret, storing quasi-permanent electrostatic charge within a single atomic layer and modulating its emission properties. Sulfur vacancies are created by stamp-assisted, electrode-free electrochemical nanolithography, yielding tunable defect densities from 1010 to 1013 cm–2. The vacancy domains act as electron traps, resulting in surface charge density up to 1 μC cm–2, with charge retention exceeding 300 days under ambient conditions. Kelvin probe and electric force microscopies reveal electrostatic patterns replicating the lithographic motif. These domains also define a colocalized exciton-quenching regions in fluorescence microimages. They modulate the exciton fluorescence lifetime recorded at room temperature from tens of nanoseconds to a few hundred picoseconds by enhanced nonradiative exciton deactivation and induce a different balancing between excitons and trion emission via free electron draining from the untreated zones of the crystal.

Nano Letters
University of Parma (IT), Institute of Materials for Electronics and Magnetism (IT), Institute of Nanostructured Materials (IT), Institute for Microelectronics and Microsystems (IT), University of Florence (IT)
Agenzia Spaziale Italiana, Ministero dell'Università e della Ricerca, NextGenerationEU
Openalex Percentile: Top 28%
2D Materials and Applications
DOIOpen Access PDFOpenAlex
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